单项选择题
The heart of the diesel engine is the （） where the fuel is burnt and the power developed.
A.crankcase B.cylinder C.scavenge box D.piston
单项选择题 The hand steering is a method by which the motion of the rudder is controlled with （）.
单项选择题 The gudgeon pin is carried in （） in the piston skirt.
单项选择题 The governor of a generator engine is to （）.
